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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b35061dbffb581c1e7eabc4a52aeacd9df92376440488e3f7ef77779c137d59b' 
  AND token = 'alcETdh3A0I3RzBTTHpZ8LWKqI1iw/c0XeE8qWm+dV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}